The story as written is all over the place. Did he shoot 3? Bludgeon 3? Shoot 2 and bludgeon 1?
Sounds like the hammer was a weapon of opportunity, and he may have already been grappling with the 3rd surviving haji, reached over grabbed a hammer and crushed his skull.
For reference a friend of mine fired 2 shots thru his windshield while he was being rammed repeatedly by some lunatic in a stolen vehicle, a tiny shard of glass got caught in his slide and it locked up like it had been rusted shut for 10yrs. Murphy’s Law. Same thing could’ve happened inside the cave with shattering rock all over the place from rounds fired.
Lot of people assuming he went into the cave with a hammer, my guess is it was already inside as a work tool and became a weapon of opportunity within arms reach, just like a flashlight or rock across the head while you’re rolling on the ground with someone.
Wish the story was written better (shocker), but either way good for him and he should drink free for a few years anywhere he goes. Whatever it takes to get it done.